Method of making valves



Jan. 5, 1937. I STREET 2,066,658

METHOD OF MAKING VALVES Filed Dec. 10, 1932 2 She ets-Sheetl Arroezvs Y5Jan. 5, .1937.

H. R.- STREET 2,066,658

METH OD OF MAKING VALVES 2 Sheets-Sheet 2 Filed Dec. 10, 1932 PatentedJan. 5, 1937 UNITED STATES PATENT OFFICE 6 Claims.

This invention relates to valves and is par ticularly directed to a newand improved method in the casting thereof.

An object of the invention is to produce valves of the pressure type,preferably by such method, with the result that a great saving in thecost of production is effected without impairing the quality andefficiency thereof.

Another object of the invention resides in the production of a valvehaving a pivoted gate or valve member which is secured within the valvebody in operative position during the casting operation.

With the objects above indicated and other 5 objects hereinafterexplained in view, the invention consists in the valve structure as anarticle of manufacture and the method of producing the same.

Referring to the drawings:

Figure 1 is a top plan view of the drag of a core mold;

Fig. 2 is a sectional view taken on line 22 of Fig. 1;

Fig. 3 is a side elevational view of a jig with 25 a core supportedtherein;

Fig. 4 is a sectional View taken on line 4-4 of Fig. 3; v

Fig. 5 is a front view of a pivoted gate or valve member;

Fig. 6 is a side view of that shown in Fig. 5;

Fig. '7 is a longitudinal sectional view of a valve mold taken on line(-1 of Fig. 8;

Fig. 8 is a sectional view taken on line 8-8 of Fig. 7;

Fig. 9 is a sectional view of a cast valve embodying the presentinvention taken on line 9-9 of Fig. 10, and

Fig. 10 is a side view of the cast valve in its finished condition.

In describing the method of casting a valve embodying the presentinvention, it should be understood, of course, that initially suitablepatterns are made in the usual manner and as the making of thesepatterns has no bearing upon the present invention, description of thesame is eliminated.

In the drawings represents generally a core mold comprising a drag 2iand a cope 22, within which has been previously formed cooperatingcavities in the drag and cope of a contour simulating the interior ofthe finished valve. The core mold 20 is further divided transversely at23 into units 24 and. 25 for the purpose of permitting the core to beformed in half portions, and angularly, for a purpose to be laterdescribed.

The unit 24 has a cylindrical core cavity 26 extending longitudinally,the inner end of which is enlarged at 21 and terminates in a smallerdiameter at 28, as clearly shown in Fig. 1. The unit 25 has acylindrical core cavity 29 in longib tudinal alignment with the corecavity 26 and adjacent its inner end is of enlarged diameter as at 30,terminating, however, short of the end adjacent the division 23.

A removable circular plug 3| is positioned 10 within a correspondinglyshaped opening 32 provided in the inner end of the unit 25 and has itsinner end 33 formed of reduced diameter and its inner surface extendingin a plane parallel with its outer surface and with the angular inner 5end of the unit 25.

A previously cast or otherwise formed gate or valve member 34 has anintegral cylindrical extension 35 provided with a longitudinallyextending opening 36', within which is secured a U bushing 31 of anysuitable material. A pin 38 is loosely disposed within the bushing 31and has its opposite ends extending beyond the ends of the cylindricalextension 35. This pin 38 is preferably made of stainless steel, so asnot to be aifected by the heat of the molten metal during the casting ofthe valve. Furthermore, to insure against securing of the gate or valvemember 34, during the casting operation the opposite end surfaces of theextension 35 are coated with a lubricant at 39, such as graphite paste,and also the portion of the pin 38, within the extremities of theybushing 31, may be likewise coated if found necessary.

In forming the core, the gate or valve member 3 34 is positioned withinthe unit 25 and properly located by, means of aligned openings 40 in thedrag and cope of the mold, which receive the extended ends of the pin38. These openings 40 are so located as to permit one face of the 4 gateor valve member 34 to engage with the angular inner surface of the plug3|, as clearly shown in Fig. 1, which thereby maintains the gate orvalve member 34 in its desired angular position. The gate or valvemember 34 has an 45 integral extension 4| formed at its lower portion,which serves the dual purpose of providing sufiicient weight to maintainthe valve member in normally closed position, as will be laterdescribed, and to limit its opening movement. With 5 this gate or valvemember 34 properly positioned within the core mold, the parts of thecore mold are moved into cooperating engagement and green sand is forcedin at the opposite ends through the cylindrical openings 26 and 29 and55 tamped in the customary manner. When the core is thus formed, thecope 22 is removed and the portion 42 of the core is placed upon one endof a jig 43, which is provided with a cavity complementary to thecontour of this portion of the core 42. The portion 44 of the core islikewise removed, with the gate or valve mem-- ber 34 embedded therein,but after the plug 3| has been removed from the opening 32. The portion44 of the core is then placed upon the opposite end of the jig 43, whichlikewise has a cavity corresponding to the contour of this portion ofthe core and both portions of the core are then secured together bymeans of foundry paste applied to the engaging surfaces of the portion42 of the core and the outer surface of the gate or valve member 34. Itwill be noted that a portion 45 of the core extends around thecylindrical extension on the gate or valve member 34, so as to providesuitable clearance to aiford ready pivotal movement of the valve member34. Furthermore, the ends of the pin 38 project beyond the portions ofthe core and the core is so shaped as to provide pockets to receive themolten metal for securing the ends of the pin.

A valve mold is generally indicated at 46 and comprises a drag 4'! and acope 48 and may be composed of green sand, or of a material of apermanent nature as the case might demand. The drag and cope havecomplementary cooperating cavities 49, which simulate the contour of thefinished valve body. Longitudinally aligned bores 5|! are provided inthe drag and cope of the valve mold and are adapted to receive thecylindrical portions 42 and 44 of the core and to properly position thelatter within the mold, as shown in Fig. 7. The core is preferablypositioned within the mold with the pin 38 at the bottom and this is toinsure proper securement of the ends of the pin 38 Within the valve bodyand is accomplished by directing the molten metal to this point firstand while it is at its hottest temperature. A pouring gate 5| isprovided in the cope of the mold and communicates with a passageway 52which passes downwardly and is divided into branches 53, which extendaround the upper surface of the cylindrical portion 42 of the core andthen extend inwardly at 54 into communication with the cavity 49.

When the molten metal is poured through the gate 5| it passes throughthe passageways and entirely fills the space between the cavity 49 ofthe mold and the outer surface of the core, the metal flowing around theends of the pin 38 securing the same therein, but without effecting thelooseness of the pin within the cylindrical extension 35 upon the valvemember 34. Furthermore, due to the lubricant upon the ends of thecylindrical extension 35, the molten metal is prevented from adheringthereto.

As the inner diameter of the portion 42 of the core is less than thediameter of the valve member 34, with which it engages, a space 55 isprovided therearound which serves as a seat for the valve member. Due tothis arrangement, it is unnecessary, for ordinary use, to machine thevalve seat as the molten metal coming in contact with the valve member34 is chilled and consequently produces a hardened valve seat 58.

After the valve 59 has been cast, it is removed from the mold and thecore is removed by the usual methods, such as tumbling or otherwise. Thevalve body 6|] has oppositely aligned openings 56 provided by thecylindrical ends 42 and 44 of the core and these openings may beinteriorly screw-threaded at 51 after the entire casting operation iscompleted. The extension 4| of the valve member 34 engages with theinner surface of the valve body and is thereby limited in its openingmovement, which eliminates the possibility of the valve member bindingor sticking due to being opened too far.

While I have described the preferred embodiment of the invention, it isto be understood that I am not to be limited thereto, inasmuch aschanges and modifications may be resorted to without departing from thespirit of the invention as claimed in the appended claims.

Having thus described my invention, I claim:

1. The method of casting a valve which consists in forming a core abouta gate having a loosely mounted pin therein, positioning the core in amold, and casting a valve body around said gate in a manner to securethe pin therein.

2. The method of casting a valve which consists in supporting a gatehaving a loosely mounted pin therein, and casting a valve body aroundsaid gate in a manner to secure the end of the pin therein.

3. The method of casting a valve which consists in supporting a gatehaving a stainless steel pin loosely mounted therein, and casting avalve body around said gate in a manner to secure the end of the pintherein.

4. The method of casting a valve which consists in supporting a gatehaving a bushing with a pin loosely mounted therein, and casting a valvebody around said gate in a manner to secure the end of the pin therein.

5. The method of casting a valve which consists in supporting a gatehaving a bushing with a pin loosely mounted therein, applying alubricant to portions of the gate adjacent the pin, and casting a valvebody around said gate in a manner to secure the pin therein.

6. The method of casting a valve which consists in forming a core insections with a gate mounted upon the inner end of one of said sections,securing the inner end of the other of said sections to the exposedsurface of said gate, said gate having a pin loosely mounted therein.positioning the core in assembled relation in a mold, and casting avalve body around said gate in a manner to secure the pin therein.

HORACE R. STREET.

